Rotary pump



Jan. 11 1927. 1,613,767

w. H. PAscoE ET A1.

ROTARY PUMP Filed August 3o, 1924 s sheets-sheet 1 gig ,l 'E

'- m mum @nu a@ 1,613,767 Jam 11 1927 w. H. PAscoE Er AL ROTARY PUMP I Filed August 50, 1924 I5 Sheebs--Shee'l 2 Jan. 11,1927. y 1,613,767

W. H. PASCOE ET AL ROTARY PUMP Filed August 30, 1924 3 Sheets-Sheet :5

Patented Jan. 11, 1927.

UNITE-D STATES WILLIAM H. PASCOE AND JOHN' TATTER, 0F CHICAGO, ILLINOIS.

RO'IARY PUMP.

Application led August 30, 1924. Serial No. 735,084.

The object of this invention is to produce a rotary pump of novel and improved construction which has a combined rotary and reci procatory motion, which comprises a minimum number of parts so constructed that the pump may be cheaply manufactured, and which is durable and efficient in operation.

More specifically, it is an object of the invention to produce a pump in which a plunger is mounted in a rotor to rotate therewith and also to reciprocate transversely of the axis thereof, and to provide novel means for effecting alrelative reciprocation of the plunger and rotor during their rotation together.

Another object is to produce a pump comprising two rotor parts turning on parallel but eccentric axes and each provided with diametrical guides arranged at right angles to each other; and a unitary plunger device having portions to reciprocate in both of said guides during rotation of said parts.

A further object isto produce a duplex pump in which both portions of the unitary plunger device mentioned in the last preceding object constitute plungers, each of which begins its stroke when the other plunger is half way through its stroke.

Another 'object is to produce a novel duplex plunger.

Another object is to provide a novel arrangement of passages for conducting Huid to and from the plunger chambers.

Additional and ancillary objects and advantages of the invention will be apparentfroln the following detailed description taken in connection with theaccompanying drawings, in which- Figure l is a side elevation of one form of pump embodying the features of our 1nvention.

Fig. 2 is a horizontal section on an enlarged scale taken in the plane of line 2-2 of Fig. 1.

Fig. 3 is a perspective view showing the unitary. duplex plunger.

Fig. 4 is an enlarged vertical section in the plane of line 4-4 of Fig. 2.

Fig. 5 is a similar section in the plane of line 5 5 of Fig. 2.

Figs. 6 and 7 are elevations ofthe abut-` ting faces of the two casing sections respectively, the one in Fig. 7 being in inverted position.

We have shown in the drawings only4 one form or embodiment of our invention and will herein describe that form in detail for the sake of illustration but it should be understood that this disclosure is givenfor the purpose of imparting an understandingof the principles of the invention and is not to be construed as an intention to limit ourselves to the particular embodiment shown and described. We propose to include all modifications and alternative constructions falling withinthe spirit and scope of the invention as defined in the appended claims.

Referring now to the drawings, the exemplary embodimentl therein shown coniprises a casing 10 composed of two similar half sections 10, 10", suitably secured together as by means of screws 11. The casing may be provide-d with a suitable base or support 12 which, in the present instance, is cast integral with the section 10a.

The casing is preferably provided with nipples 13, 14 which form an inlet and an outlet and afford a convenient lmeans for attachment of pipes. stance both nipples are formed on the same casing section at opposite sides thereof, but the arrangement and location of said nipples may be varied to suit requirements.

Within the casing are two cylindrical bores 15, 16, the axes of which are parallel but eccentric or offset, said bores being formed in the respective casing sections and opening onto the abutting faces thereof. Two rotors 17 18 fit in these bores with their adjacent side faces abutting against each other. @ne of these rotors, preferably 17, is fixed to and may be integral with a co axial drive shaft 19 which extends through 'a bearing 20 in the casing and is provided with suitable driving means such as a pulley 2l., A

Each of the rotors 17 18 has a transverse guide which are preferably in the form of slots 22, 23 in the abutting faces thereof, the slots extending diametrically across the rotors and having straight parallel sides. In the present instance the slots are rectangular or square in cross section. The two slots are disposed perpendicularly to each other andy they receive a unitary duplex plunger element 24 comprising two slides 24a, 24b dis? posed perpendicularly to each other in symmetrical relation. These two plunger" slides are rigidly fixed together and may be formed from an integral piece of metal, The length of the slides isless than the diameter of their respective rotors or the ln the present in' length of the slots 22, 23 therein, so that said slots and slides act as cylinders and pistons providing chambers at opposite ends of the slides into and from which fluid is drawn and discharged in the operation of thefpump.

The casinglO is provided with a peculiar arrangement of passages and ports to supply fluid to and receive it from both piston and cylinder units. Leading from the inlet nipple 13 the casingisection 1()a a lower channel 25 running circumferentially nearly halfway around the casing and communicating at one end with a port 26 which opens onto the side face of said section. Diametrically across from said port 26 another port 27 opens onto said casing face and communlcatesl with an upper channel 28 which leads circumferentially around the casing and communicates with the. outlet nipple 14. These channels and ports are duplicated in the other casing section 10b. There a port 29 opens onto the side face of said section and registers with the port 26 so as torece ive fluid from the channel .25 and inlet 13, and this port 29 communicates lwith an upper channel 30 running circumferentially about half way around the casing section 10". Another port 31 leads from a lower circumferential channel 32 and opens onto the face of the casing section 1.0b to registerpwith the port 27 and deliver fluid into the channel 28 and outlet 14.

The ends of the exposed portions of the lower and upper channels 25, 28 or 32, 30 of either casing section are spaced aparta distance equal to the width of the associated plunger slide 24a, or 24h, so as to leave dead or cut-off portions 33 at diametrically opposite points in the periphery of the bore 15 or 16 to separate the inlet and outlet passages. These cut-oil' portions 33 in one -casing-section are disposed in horizontal alinement with such portions in the other section.

In operation, when the drive shaft 19 is rotated, both of the rot0rs\.17, 18, will be driven, the plunger element 24 communicating motion from the rotor 17 to the rotor 18. Due to theJ eccentricity of the rotors the ytwo plunger slides 24a, 24", will be caused to reciprocate in their guides or slots 22, 23, in the rotors. In Fig. 5 the slide 24a is in its extreme right hand position at one end of a stroke. Assuming the rotors to be turning in a yclockwise direction as indicated by the arrows, the opening 13 will be the inlet and the opening 14 will be the outlet. first half'revolution from the position seen in Fig. 5 the right hand end of the slide 24a will draw in fluid continuously from the inlet 13 and lower channel 25 and the fluid in the chamber at the left hand end of this slide will simultaneously be discharged into.

the upper channel 28 and outlet 14. At each In the v half revolution of the rotor the opposite ends of this slide act alternately to draw in and expel the fluid steadily, so that in each comother slide is half finished. Since both slides draw fiuid from the common inlet and deliver it to the common outlet there will. in

.the-pump as a whole, be four suction impulses and four discharge impulses at each complete revolution of the rotors.

r4It. will be noted that the inlet channel for one section 10a is at the bottom of the casing and for the other section 10b is at the top, but these two channelsoverlap and are connected by ports 26, 29, at points adjacent to the cut-o portions 33 so that fluid is supplied continuously -to both channels. The same is true of the exhaust channels, 28, 32, which are connected bythe registering ports 27 and 31. i i

The pump is reversible, that is to say, may be driven in either direction with the same efficiency, and when reversed the direction of flow of fluid through the pumpis reversed so that the inlet and outlet 13, 14 become respectively the outlet and inlet. Either of the rotors may be the driver, the other one being driven therefrom by the plunger element 24.

It will be noted that the entire pump comprises but five parts` to wit, the two casing sections, the two rotors, and the plunger element. These parts areso shaped and constructed that expensive machinev op-Y erations are unnecessary so that the pump may be very cheaply made. It is also very durable, efficient in operation, and may easily be lubricated.

If the channels and ports 29, 30, 31, 32 in the casing-section 101 be eliminated, the pump will function as a single plunger pump, in which case the size of the parts in the casing section l0b may be greatly reduced, that is to say, the casing section may be thin in an axial direction, the rotor 18 may likewise be thinner and `srna'ller in diameter, and the plunger slide 24b may be of. much smaller dimensions to form merely a rectangular projection on the slide 24a cooperating with the slot in the rotor 18 to effect the reciprocation of the slide 24 in its rotor 17.

We claim as o ur invention:

1. A rotary pump comprising, in combination, a. casing having two cylindrical bores eccentric to each other, two rotors in 'said bores abutting face to face and turning other, a unitary plunger comprising twoslides disposed perpendicularly to each other and tting respectively in said slots whereby a relative reciprocation of each slide in its slot will be caused during rotation of said rotors, and suitable inlet and outlet passages in said casing arranged to communicate with said slots.

2. A rot-ary pump having, in combination, a casing having a cylindrical bore, a rotor fitting concentrically in said bore and having a diametrical slot in one side face, a slide fitting in said slot and being shorter in length than the diameter of said rotor, the casing having an inlet'and an outlet each including a channel extending circumferentially around and opening into said bore, the two channels being located at diametrically opposite sides of said bore, the adjacent ends of the inlet and outlet channels being spaced apart a distance equal to the width of saidslot and the slide therein, a noncircular part ixed to said slide, and a rotary element mounted in the side of said casing. which opposes the Slotted side of said rotor, said element rotating on an axisf eccentric to the axis of said rotor, said element having an elongated diametrical slot therein disposedperpendicularly to the slot in the rotor and fitting said non-circular part to prevent relative rotary movement of said.

part and element but permit relative sliding movement of said partin the slot in said element, whereby the rotation of said rotor will cause relative reciprocation of said slide in its slot in the rotor to cause fluid to be drawn from said inlet channel-into one end of said slot in the rotor continuously for approximately one-half revolution of the vhaving flat para `rotor and tocause simultaneously fiuid to be discharged from the opposite end of the slot in the rotorl into the outlet channel during suchy one-half revolution.

3. In a rotary pump, in combination, two rotary eccentric parts having two diametrical slots in their respective adjacent faces disposed perpendicular to each other and an element connecting said rotary parts to drive one from the other, said element having two portions tting slidably but non-rotatably in said slots. Y

4.A A compound plunger for rotary pumps comprising two plunger elements each having Hat parallel opposed sides, said elements being dlsposed perpendicular to each other and being formed out of an integral piece of metal;

5. In a rotary pump7 in combination, tivo rotary eccentric parts having two diametrical slots in their respective adjacent faces disposed angularly to each other, and an element connecting said rotary parts to drive one from the other, said element having two portions fitting slidably but non-rotatably in said slots.

6.- A compound plunger for rotary pumps comprising two plunger elements, each having fiat parallel opposed sides, said elements being disposed angularly to each other and being formed out of an integralipiece of material.

` 7. A compound plunger for rotary pumps comprising two lplunger elements, each el -opposed sides, said elements being disposed angularly to'each other and being rigidly connected together with said fiat sides adjacent each other.

' In testimony whereof we have hereunto aiixed our signatures.

WILLIAM H. PAscoE. i vJOHN TATTER. 

